#include <bits/stdc++.h>
using namespace std;
#define int long long
void solve()
{
    int a,b,c,d;
    cin>>a>>b>>c>>d;
    if(c<a)cout<<"Yes";
    else if(c==a)
    {
        if(d<b)cout<<"Yes";
        else cout<<"No";
    }
    else cout<<"No";
}
signed main()
{
    //ios::sync_with_stdio(false);
    //cin.tie(nullptr);
    int T=1;
    //cin>>T;
    while(T--)
    {
       solve();
    }
    return 0;
}